I rewatched the episode in which Midousuji jumped up onstage, during the opening ceremony of the Inter-High, to trash-talk the reigning champions and the kid he likes to bully (because he knows he's gotten into his head). That indeed is the one where Midousuji explains his choice of frame size and configuration (super high saddle, extended handle bars). In his (borderline insane) mind, it's all about minimizing the weight. In a later episode, he drapes the upper half of his extremely elongated body over the handlebars, so that his head is practically in front of his front wheel, as part of his special sprinting technique. I'd love to see someone ride a De Rosa like that in real life!

In any sports anime, there are characters who have some wacky style/look to distinguish themselves. Midousuji is a great villain in this sports context. "Pendulum dancing" btw is not the name of Makishima's style, but the full name of the dancing technique used by all racers.

I'm much more familiar with the sport of American football, but I still enjoyed Eyeshield 21 immensely. It's got even more outrageous exaggerations - linemen who are at least twice as tall and 3x as heavy as other linemen, a demonic QB who can pass a ball so that it flies perfectly parallel to the ground, only 5 ft. above ground, for 70 yds; star receivers and CBs who can hold entire conversations in the air, etc.